Calycopeplus is a plant genus of the family Euphorbiaceae first described by Jules Émile Planchon as a genus in 1861.Planchon, Jules Émile. 1861. Bulletin de la Société Botanique de France 8: 30-32 descriptions in Latin, commentary in FrenchTropicos, Calycopeplus Planch. The entire genus is endemic to Australia.Kew World Checklist of Selected Plant FamiliesGovaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew. Its closest relative is Neoguillauminia from New Caledonia.
The type species is Calycopeplus ephedroides, which is a synonym of Calycopeplus paucifolius.
Species Calycopeplus casuarinoides L.S.Sm. – Queensland Calycopeplus collinus P.I.Forst. – Northern Territory, Western Australia Calycopeplus marginatus Benth. – Western Australia Calycopeplus oligandrus P.I.Forst. – Western Australia Calycopeplus paucifolius (Klotzsch) Baill. – South Australia, Western Australia
Description The plants in this genus are monoecious, with the single sex flowers found in different parts of the same inflorescence. The female flowers are solitary and in the centre, while the male flowers are found in 4 clusters of 3–16 flowers within the involucre opposite the lobes. Each cluster is surrounded by bracts, with the outer one or two being enlarged and enclosing the cluster.
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